Automatic door bolt



Sept 1949- 4 J. .1. ROUSSEAU I 2,481,154

AUTOMATIC DOOR BOLT Filed Dec. 25, 194? v IN VEN TOR.

aloha/med J ,Fowmam A'ITU RNEYS Patented Sept. 6, 1949 Capetown, SouthAfrica, assignor of one-half to Christoffel F. van Heer- Johannes JRousseau,

den, Capetown, South Africa Application December 23, 1947, Serial No.793,403 3 Claims. (01. 292-1) This invention relates to'an automaticdoor bolt arrangement.

It is an object of the present invention to provide a door boltarrangement for double doors whereby both doors are automaticallylatched as they are swung closed and whereby automatically upon pullingthe moving door alone to open the same the fixed door will beautomatically released, the fixed door having a bolt with a transversecontrol crank and the moving door having a catch adapted to grip thecrank to retain the door locked or to pull upon the crank when openingthe door to release the bolt of the fixed door.

Other objects of the present invention are to provide an automatic doorbolt arrangement on fixed and moving doors, which is of simpleconstruction, inexpensive to manufacture, easy to install on the doorsand eflicient in operation.

For a better understanding of the invention, reference may be had to thefollowing detailed description taken in connection with the accompanyingdrawing, in which Fig. 1 is a fragmentary elevational view of fixed andmoving doors with the automatic door bolt arrangement of the presentinvention secured thereto,

Fig. 2 is an enlarged sectional view taken on line 2-2 of Fig. 1 andthrough the bolt of the fixed door,

Fig. 3 is a sectional view, in elevation, taken through the catch on themoving door and on line 3-3 of Fig. 1.

Referring now to the figures, l represents a fixed door adapted to bedrawn against a doorway plate or door frame H. This plate H has a holeI2 over which is secured a metal plate or keeper plate l3 by means ofscrews M. The plate likewise has a hole l5 through which a latch bolt isis extended to retain the door In in the closed position. The latch boltI6 is slidable in a casing 11 fixed on the door In by screws l8. Aspring l9 within the casing urges the bolt l6 into locking engagementwith the opening H: of the plate l3. The portion I9 of the plate l3nearest the door in, as clearly shown in Fig. 2, is rounded to cooperatewith the inclined end face 20 of the bolt to facilitate its movementonto the plate, causing the bolt to be moved into the casing l1 againstthe action of the spring T9.

The casing has its attaching plate 20, through which the screws 18 areextended formed with folded up portions 2| for supporting control shaft22 having a crank portion 23 which extends laterally over a moving door24 adapted to be brought against the plate II. The shaft 22 has an arm25 which'is projected into a hole 26 in the bolt so that as the shaft isrotated in a clockwise direction as viewed in Figure 2, the bolt will beretracted from the opening l2 and I5 of the respective plates II and 13.

On the moving door 24, is a spring catch device indicated generally at21 and having a casing 26 with a flange 29 secured by screws 3! with thedoor face. A hook lever 32 is pivoted to the casing 26 by a pin 34 andis normally urged to a position to retain crank 23 by a compressionspring 33 acting against a handle portion 35 of the hook 32. The top ofthe hook lever 32 is rounded as indicated at 36 so that the crank 23might ride over the hook lever to be caught thereby in the manner asshown in Figure 3.

If it is desired to release only the moving door from the opening, thehandle portion 35 is depressed so as to free the hook lever 32 from thecrank 23. On the other hand if it is desired to automatically open bothdoors, the moving door is pulled and the hook lever 32 will thereby pullthe crank 23 to rotate shaft 22 and to release bolt Hi from its opening.Accordingly both doors will automatically be released upon pulling themoving door.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claims.

I claim:

1. An automatic door bolt arrangement comprising a casing, adapted to besecured to a door, a bolt slidable in the casing and adapted to latchwith a keeper plate, a transversely extending means connected to thebolt to retract the same, catch device adapted to be secured to anotherdoor and adapted to engage with the transversely extending means as theother door is closed, said catch device being operable upon thetransversely extending means to retract the bolt as the other door ispulled to the open position and to be releasable from the transverselyextending means whereby both doors may be opened by a single pull on theother door.

2. An automatic door bolt arrangement comprising a bolt casing adaptedto be fixed to one door, a latch bolt operable within the casing to beextended to a position for locking the door to a door frame, shaft meansjournalled on the casing and operatively connected with the bolt tooperate the same, said shaft means having a crank portion extendinglaterally over the side of the door to be in alignment with a catchdevice adapted to be secured to another door, said an open position torotate the crank portion and catch device being engageable with thecrank said shaft means to automatically release the latch bolt of theone door. the catch is brought to its closed position besides 3. Anautomatic door bolt arrangement" CQUL-- theqncedqqr; endcahancfleportion; on said hook prising abolt casing adapted to be fixed toone lever by=whiclrthe hoolrlever can be pivoted to door, a latch boltoperable within the casing to 10 free the catch of the crank portionwithout havbe extended to a position for locking the door to ingto openthe one door.

a door frame, shaft means Journalled entice m I JOHANNES J. ROUSSEAU.ing and operatively connected with the bolt to operate the same, saidshaft means. having; a; REFERENCES CITED crank portion extendinglateraIly over the side,v 151 'rhgfiomwing gg n r of record in the ofthe door to be in alignment with a catch defile 0f th t;

catch device being engageable with the crank UNITED STATES PATENTSportion to hold the other door in the closed po- Number Name Date sitionbut operablenasthe other door ismoved to. 2 1,970,366 Volght a.-- Aug.12.,.,1913

